J.  Hamilton, ?Catalogue of the Coleoptera of Southwestern Pennsylvania, with notes and descriptions.?, Transactions of the American Entomological Society, vol. 22, pp. 317-381, 1895.

J.  Hamilton, ?Descriptions of some species of Coleoptera occurring near Allegheny, heretofore undescribed?, The Canadian Entomologist, vol. xxv, pp. 305-310, 1893.